From 85c0db3433edf053a477976aa1e2e4deb84d5905 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 5 Oct 2022 18:06:20 -0700
Subject: [PATCH] Update M4 version numbers in documentation

---
 README            | 4 ++--
 README-hacking    | 2 +-
 doc/autoconf.texi | 7 ++++---
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/README b/README
index f6bafdbb..f467f410 100644
--- a/README
+++ b/README
@@ -11,8 +11,8 @@ operating system features that the package can use, in the form of M4
 macro calls.
 
 Producing configuration scripts using Autoconf requires GNU M4 and
-Perl.  You should install GNU M4 (version 1.4.6 or later is required;
-1.4.14 or later is recommended) and Perl (5.006 or later) before
+Perl.  You should install GNU M4 (version 1.4.8 or later is required;
+1.4.16 or later is recommended) and Perl (5.006 or later) before
 configuring Autoconf, so that Autoconf's configure script can find
 them.  The configuration scripts produced by Autoconf are
 self-contained, so their users do not need to have Autoconf (or GNU
diff --git a/README-hacking b/README-hacking
index b4189ee4..e15128fa 100644
--- a/README-hacking
+++ b/README-hacking
@@ -16,7 +16,7 @@ tools we depend upon, including:
 
 - Automake 1.11+ <https://www.gnu.org/software/automake/>
 - Help2man 1.29+ <https://www.gnu.org/software/help2man/>
-- M4 1.4.6+ <https://www.gnu.org/software/m4/>
+- M4 1.4.16+ <https://www.gnu.org/software/m4/>
 - Perl 5.006+ <https://www.cpan.org/>
 - Texinfo 4.11+ <https://www.gnu.org/software/texinfo/>
 
diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index 38e08597..c6eebe2c 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -767,10 +767,10 @@ for more information.
 Autoconf imposes some restrictions on the names of macros used with
 @code{#if} in C programs (@pxref{Preprocessor Symbol Index}).
 
-Autoconf requires GNU M4 version 1.4.6 or later in order to
+Autoconf requires GNU M4 version 1.4.8 or later in order to
 generate the scripts.  It uses features that some versions of M4,
 including GNU M4 1.3, do not have.  Autoconf works better
-with GNU M4 version 1.4.14 or later, though this is not
+with GNU M4 version 1.4.16 or later, though this is not
 required.
 
 @xref{Autoconf 1}, for information about upgrading from version 1.
@@ -26428,7 +26428,8 @@ __file__
 __line__
 @end example
 
-Autoconf requires version 1.4.6 or later of GNU M4.
+Autoconf requires version 1.4.8 or later of GNU M4.
+It works better with version 1.4.16 or later.
 
 Since only software maintainers need to use Autoconf, and since GNU
 M4 is simple to configure and install, it seems reasonable to require
-- 
2.37.3